const puppeteer = require('puppeteer');
const fs = require('fs');

(async function ()
{
    try
    {
        console.log("StageRack HTML to PDF conversion tool");
        var args = process.argv.slice(2);
        let url = args[0];
        let fileDestination = args[1];
        
        if (url === undefined)
        {
            console.log("Didn't get an URL");
            process.exit(10);
        }
        console.log("    -> URL  ", url);
        
        if (fileDestination === undefined)
        {
            console.log("Didn't get a file destination");
            process.exit(11);
        }
        console.log("    -> File ", fileDestination);
        
        if (fs.existsSync(fileDestination))
        {
            console.log("[ERROR] The file \"" + fileDestination + "\" already exists");
            process.exit(12);
        }
        
        const browser = await puppeteer.launch({headless: true, args: ['--no-sandbox']});
        const page = await browser.newPage();
        page.on('requestfailed', function(request)
        {
            console.log("Request failed", request);
            process.exit(13);
        });
        page.on('pageerror', function(request)
        {
            console.log("Page Error", request);
            process.exit(13);
        });
        console.log("Rendering data...");
        let response = await page.goto(url, {waitUntil: 'networkidle0'});
        let httpStatus = response.status();
        console.log("    -> Got HTTP code " + httpStatus);
        if (httpStatus !== 200)
        {
            console.log("Error: got HTTP response " + httpStatus + ". Aborting");
            process.exit(20);
        }
        await page.emulateMediaType('print');
        
        
        console.log("Creating the PDF document...");
        // Documentation for this function: https://pptr.dev/api/puppeteer.page
        await page.pdf(
        {
            path: fileDestination,
            format: 'A4',
            omitBackground: false,
            printBackground: true,
            preferCSSPageSize: true,
            margin: 
            {
                left: "1.27cm",
                right: "1.27cm",
                top: "1.27cm",
                bottom: "1.27cm",
            }
        });

        console.log('Conversion complete. PDF file generated successfully.');
        

        await browser.close();
    } catch (error)
    {
        console.log('An error occurred:', error);
        process.exit(1);
    }
    process.exit();

})();